刚性桩复合地基垫层对桩土应力比影响分析

Analysis on the Cushion Design for Rigid Pile Composite Ground

从极限平衡理论角度对刚性桩复合地基中垫层作用机理进行分析,提出桩顶垫层厚度、垫层材料内摩擦角等参数对桩土应力分担的控制公式,推导出在已知表面应力情况下考虑桩土共同作用的桩土沉降计算公式,在此基础上提出一种桩土应力比的迭代计算方法。编制程序实现对算例的计算,总结分析计算结果并与实测值进行对比验证。

Based on limit equilibrium theory, the effect on pile-soil stress ratio made by cushion thickness on pile and internal friction angle of cushion is analyzed. The calculating formulae of the settlement of pile-soil under foregone pressure is proposed, which account the interaction of pile-soil. Depending on the methods deduced above, the iterative calculating method for pile-soil stress ratio is put forward. A program is written and the samples are calculated. The analyses for results and the comparison with experimental date are presented.